#nav{
    position:fixed; /* 绝对定位，fixed是相对于浏览器窗口定位。 */
    top:0; /* 距离窗口顶部距离 */
    left:0; /* 距离窗口左边的距离 */
    width:100%; /* 宽度设置为100% */
    height:50px; /* 高度 */
    z-index:99; /* 层叠顺序，数值越大就越高。页面滚动的时候就不会被其他内容所遮挡。 */
    background-color: #b90707;
}
#nav ul{list-style:none;margin-top: 12px;}
#nav ul li{float: left;margin-left:30px;}
#nav ul li a{color: white;text-decoration:none;font-size: 18px;}
#nav ul li a:hover{color:grey;}
#nav img{width: 30px;height: 30px;float: right;}
#nav ul li:nth-child(7){float: right;margin-right: 50px;}
#nav ul li:nth-child(8){float: right;margin-left: 30px;}
#nav ul li:nth-child(9){float: right;margin-left: 30px;}

#neirong{margin: 0 auto;width: 1000px;}
h1{position: relative;top: 50px;}
hr{position: relative;top: 55px;border-top:5px groove orangered;}
.ps-pic{width: 500px;height: 500px;position: relative;top: 70px;}
.pic03{position: relative;top: -350px;left: 40px;}
.pic07{position: relative;top: -350px;left: 40px;}

#introduce{width: 800px;position: relative;top: 60px;left: 90px;}
#tool{width: 800px;position: relative;top: 80px;left: -160px;font-size: 16px;}
#make{width: 800px;position: relative;top: 60px;left: -160px;font-size: 16px;}
#haidai{width: 400px;height: 400px;position: relative;top: 20px;left: 140px;}
#milk{width: 400px;height: 400px;position: relative;top: 20px;left: 180px;}
#soup{width: 520px;height: 400px;position: relative;top: 20px;left: 180px;}
#rice{width: 580px;height: 400px;position: relative;top: 20px;left: 140px;}

#tips{position: relative;left: 200px;}
p{position: relative;top: 30px;left: -100px;}
#tips1{position: relative;left: -350px;top: 10px;}
.comment{
	position:relative;
	top: 50px;
	left: 100px;
	/*border:5px solid coral;*/
	width:700px;
	height:400px;
	/*background:#FF0;*/
	/*border-radius: 10px;
	border-style: outset;*/
	}
.comment1{
	width:700px;
	position:relative;
	left:15px;
	top:-10px;
}
#ul1{width:650px; overflow:auto;height:280px; s list-style:none;padding:0px;}
#ul1 li{border-bottom:1px #999 dashed;padding:4px;}